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Meh... I dont trust cheap gauges. There is only 1 reason for the price difference.. lol but if it works sweet.
I didnt really either to begin with but I went ahead and tried them out anyway and asked the tuner to check them out to make sure they were all good compared to what the dyno was saying and he said they are good to go. He said usually "tuner cars" run prosport gauges though but they do work. There is usually 2 reasons items will be more expensive or cheaper. 1 is quality and the other could simply be the name. When I run an intercooler with a smaller pulley later down the road I will have them checked out again tho make sure they are all good.
IMO wideband o2 is probably the best gauge.. if your a/f gets wacky, you know its a fuel problem pretty much right off the bat...so really its a multipurpose gauge. You dont need the fuel pressure.
You really dont need any... by the time you notice something wrong with nitrous your likely going to be looking as your pistons in your passenger seat lol.
If you have a wideband, youll notice something wrong in the fuel department immediately.